ehituslikku tervikut moodustav rühm ühetüübilisi elektriakumulaatoreid, mis on ühendatud nii, et oleks võimalik saada soovitaval hulgal soovitava pingega elektrivoolu
set of accumulators capable of being recharged, when exhausted, from an external electrical supply
If the emergency electrical power source is an accumulator battery and the main electrical power source fails, the accumulator battery must be automatically connected to the emergency electrical switchboard and supply power for an uninterrupted period of three hours to the systems referred to in the first, second and third indents of the second subparagraph.
